[FFmpeg-user] Seeking smart decomb filter

[Paul B Mahol]

On Thu, Jan 21, 2021 at 1:51 PM Mark Filipak (ffmpeg) <markfilipak at bog.us>
wrote:

> On 01/21/2021 07:31 AM, Paul B Mahol wrote:
> > On Thu, Jan 21, 2021 at 12:51 PM Mark Filipak (ffmpeg) <
> markfilipak at bog.us>
> > wrote:
> >
> >> On 01/20/2021 04:50 PM, Paul B Mahol wrote:
> >>> On Wed, Jan 20, 2021 at 10:45 PM Mark Filipak (ffmpeg) <
> >> markfilipak at bog.us>
> >>> wrote:
> >>>> On 01/20/2021 06:17 AM, Paul B Mahol wrote:
> >>>>> Motion compensation does not work that way.
> >>>>
> >>>> Thank you, Paul. Yes, I knew that. I'm not seeking motion
> compensation.
> >>>> Kindly reread my filter
> >>>> features and suggest what comes closest. What I seek simply works on
> >>>> pixels. I'm relying on your
> >>>> experience (and perhaps the experiences of others here).
> >>>
> >>> Have you tried nnedi or estdif filters? Both are intra only
> >> deinterlacers.
> >>
> >> Thank you for the guidance. I'm trying estdif first because it seems
> >> simpler, but it doesn't do the
> >> good thing. It does decomb very effectively, but it does it by aligning
> >> (shifting) the edges in
> >> field'2' to the edges in field'1' (which are not shifted). Aligning with
> >> field'1' produces judder
> >> (or in my case, doesn't eliminate judder). What I want it to do is align
> >> both field'1' edges and
> >> field'2' edges to the median (i.e. half way between the input's edges).
> I
> >> do realize that such a
> >> method would introduce combing along the edges of the frame, but that's
> >> okay.
> >>
> >> Here's the command I used to transcode 24FPS to 60FPS:
> >> ffmpeg -i 24[1][2].mkv -map 0 -filter_complex "telecine=pattern=5,
> >> split[1][2],
> >> [1]select=not(eq(mod(n\,5)\,2))[3], [2]select=eq(mod(n\,5)\,2),
> >> estdif=mode=frame[4],
> >> [3][4]interleave" -codec:v libx265 -x265-params "crf=16:qcomp=0.60"
> >> -codec:a copy -codec:s copy
> >> 24[1][2]-to-60[1][1][estdif=mode=frame(1~2)][2][2].mkv
> >>
> >> I'll try nnedi. Perhaps I can figure it out.
> >>
> >
> > Do not even try.
> > Mentioned filters work only with interlaced frames, while your use case
> is
> > completely invalid and frowned upon.
> > I deeply regret replying to this thread.
>
> I did get nnedi to work but with similar results to estdif.
>
> Kindly educate me: What do you mean by "interlaced frames"? Aren't all
> frames that come out of the
> decoder and into the filter chain interlaced?
>
> Why do you say that my use case is invalid? telecine=pattern=5 works very
> well -- there's no judder
> at all! And if, for the combed frame, I use pp=linblenddeint, it's even
> better, far better than what
> either the NVIDIA GPU or the TV does when fed a 24FPS source and of course
> far, far better than
> telecine=pattern=23.
>
> Please educate me. Why are my stunning results invalid?
>

Because you are trying to interpolate new frames using telecine filter.


>
> Regards,
> Mark.
>
> >> Thanks again,
> >> Mark.
> >>
> >>>> Regards,
> >>>> Mark.
> >>>>
> >>>>> On Wed, Jan 20, 2021 at 2:45 AM Mark Filipak (ffmpeg) <
> >>>> markfilipak at bog.us>
> >>>>> wrote:
> >>>>>
> >>>>>> Hello All,
> >>>>>>
> >>>>>> I seek a decomb filter that operates on H/2 number of line pairs:
> >> lines
> >>>> i
> >>>>>> & i+1 (where i=0..H/2-1),
> >>>>>> by aligning edges in the two lines at x = delta-x(edge)/2 (i.e. the
> >>>>>> median). The ideal filter would
> >>>>>> differentiate overall motion due to panning versus local motion due
> to
> >>>>>> local object motion.
> >>>>>>
> >>>>>> Pan-combing on the left & right edges is acceptable but it would be
> a
> >>>>>> great bonus if the filter
> >>>>>> performed blend on those edges with the blending radius equal to
> >>>> one-half
> >>>>>> the pan-comb.
> >>>>>>
> >>>>>> Vertical, line-pair-to-line-pair processing is not needed or
> desired.
> >>>>>>
> >>>>>> Frame-to-frame processing is not needed or desired.
> >>>>>>
> >>>>>> I have been trying a great number of filters based on their names
> and
> >>>> what
> >>>>>> is in the documentation.
> >>>>>> The best I've found so far is pp=linblenddeint but it obviously
> >> doesn't
> >>>>>> align edges via the edge
> >>>>>> median and it obviously isn't aware of pan-combing versus
> >>>>>> object-motion-combing.
> >>>>>>
> >>>>>> Any suggestions are very welcome. If I find this filter I will post
> a
> >>>> link
> >>>>>> to a 60FPS telecined
> >>>>>> video that will amaze everyone -- better than anything that Cuda can
> >> do.
> >>>>>>
> >>>>>> -Mark.
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